Every company has a story heading into E3 each year, they all have something to prove, something to show off and something to gain. At the Los Angeles congregation of gaming's biggest developers and publishers, each will try to outshine the other and "win" E3.
For Sony, they have the luxury of being able to sit back a bit given sales of the PS4 are still going strong worldwide. They may even be able to announce they've crossed the 25 million mark at their press conference.
Complacency will cost you big time in this industry however (take for example... well, any major publisher at some point or another) so while Sony can let their so-far lacking 2015 line-up slide, they do need to give people a lot of reasons to be hopeful for 2016, and maybe beyond.